kitannarc11 kitannarc11

08-03-2017
Mathematics

contestada

The equation -5x^2+72x+378 models the number of students enrolled in a school where x is the number of years since the school first opened in 1990. How many students did the school have when it opened?

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Cellow111 Cellow111

17-03-2017

-5x+72x=67x
2+378=380
67x=380
380/67=6
x=6

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